Chalky moth

The chalky moth, scientifically identified as Acontia cretata, belongs to the order Lepidoptera and the family Erebidae. Although often overlooked compared to major agricultural pests, this moth species can cause significant damage in specific agro-ecological zones, particularly where its host plants are cultivated on a commercial scale.

This species primarily targets plants within the Malvaceae family, with cotton being the most economically significant host. The presence of Acontia cretata is often localized in warmer climates, where the ecological conditions favor both the host plant growth and the rapid reproduction cycle of the moth throughout the vegetation season.

The biology of the moth follows a typical holometabolous development: eggs are laid on the leaves, followed by larval, pupal, and adult stages. The larvae are the primary stage of concern for agronomists, as they are voracious feeders. Pupation usually occurs within the soil or debris, allowing the insect to survive unfavorable conditions during the overwintering period.

The economic impact of this pest results from the larvae consuming leaves, flower buds, and squares of the cotton plant. Severe infestations can lead to significant defoliation and a reduction in fruit set, ultimately impacting the final yield quantity and fiber quality. Scouting is essential to detect larvae before damage thresholds are exceeded.

Effective management requires an integrated approach to minimize crop losses. Recommended strategies include:

• Monitoring adult populations using light traps during peak emergence periods.
• Application of selective insecticides when larval densities exceed the economic threshold.
• Weed management programs targeting alternative host plants within the Malvaceae family.
• Deep tillage after harvest to disrupt pupal sites in the soil profile.